Dear Osmocom developers,
In our project we have been using the gsmtap pseudo-header to store UMTS and LTE signalling traces in pcapng format. This is very efficient compared to our previous implementation based on DLT_USER, and thanks to the gsmtap dissector, it allows any *shark app to read our output file.
When looking for the proper type and sub_type for NR signalling traces, I discovered they are not yet part of the standard. I found several threads of discussion about this, from about 2017 onwards, and I understand it is a matter of time and resources if the version 3 of GSMTAP has not been released.
The most interesting feature I have read about is the ability to extend the header with a TLV approach. EARFCN, eNodeB-ID, PCI, are useful metadata we would like to add to our traces.
In an ideal world, I would like things to be put in motion so that a new version of GSMTAP could see the light. More humbly, I ask you what kind of help is needed. Are you waiting for a draft specification? Are all requirements well known?
I suppose that LTE and NR are not the main focus today for liboscmocore development, but there are many projects out there waiting for the GSMTAP format to be updated.
Thanks!
Mauro
Hi,
I am trying to setup a simple Network In The Box 2G network. I am only interested in CS capabilities (voice calls, SMS, USSD). I am currently running the following elements with the default configurations:
- osmo-bts-trx (connecting to osmo-trx-uhd driving a USRP B205mini-i)
- osmo-bsc
- osmo-msc
- osmo-hlr
- osmo-mgw
- osmo-stp
I built all the programs from source on Ubuntu 22.04. Everything is running locally on one machine.
Everything seems to function correctly at first, but I noticed that sometimes when I try to execute an USSD code or make a call, my Channel Requests are not being responded. I noticed when this happens, osmo-bts shows the following notice:
DPCU notice PCU socket not connected, dropping message (pcu_sock.c:1018)
As I understand from the documentation (https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_I…), this component is not required for circuit switched services as the ones I am requesting, so I do not understand why this is happening. I assume something in the configuration files is telling the BTS or some network element that the PS side of the network is active, but I haven't found anything related to PCU in any of configuration files.
While I'm here looking at the mailing list, I have been thinking about
asking about the following, and no need to delay it, I suppose -
Upcoming OsmoDevCon attendees may have noticed the proposed and
scheduled session on CSFB testing.
Well, since - and sort of because that session was accepted, (and also
an iPhone 6 that supports the band of an eNB I have at home dropped into
my possession) - I've been prompted to advance my knowledge and
understanding of issues, and the iPhone (6 at least) is now doing MO
CSFB perfectly, and I think I see what some other observed issues are about.
I'm still happy if there's interest to do the session of course,
although maybe some might question whether it is more productive to just
file tickets/issues and work them out the usual way.
This email is not to suggest in any way to cancel the session, but
rather to ask if maybe we might expand the scope.
I'm thinking for example also testing 2G data. The older basic 2G + GPRS
"chocolate bar" type phones I have don't work anymore, they used to.
(not sure what one might actually do with such a device and GPRS these
days, but that's not the point, right?)
Someone (vadim?) brought a 2G (was it a credit card?) terminal once to
devcon. Does it work? that kind of thing. So thinking about all this,
I'm asking the question of whether there is interest to have a kind of
events style setup during the conference. lynxis I think has a server
for that, or maybe it's only a VM?
I don't mean a distracting always-on setup, and I don't mean to put
emphasis on cellular projects. But if we did want to have something
multi RAT, available for anybody who might want to glance in that
direction (during a USSE for example), then some (small) amount of
logistics preparation is necessary, no?
Thanks.
k.
Hi all,
While working with open5gs + kamailio, one traditionally always needed two HSS:
* the open5gs one with its mongodb and nodejs hell
* the FHoSS one for the kamailio IMS core
For some time there's now PyHSS, which supports both EPS and IMS subscriptions, which
is of course nice. docker_open5gs meanwhile also has switched to using it as default.
The big problem is that it doesn't actually state which license it is
under, which makes it legally impossible to [re]distribute it, or to even make a fork
of the repository, as that would be a violation of copyright. At least German users
are abel to legally use it, as under German copyright law you don't need
a license from the copyright holder to use a program that you have obtained legally.
In order to automatize the steps described in the open5gs_docker to create
subscribers, I've just hacked up a small tool, see
https://gitea.osmocom.org/laforge/pyhss-tool/src/branch/master/pyhss-tool.py
Using that tool, it's as easy as
pyhss-tool.py subscriber-create --imsi 001011111111111 --msisdn 1111 --k 000102030405060708090a0b0c0d0e0f --opc 00000000000000000000000000000000
or
pyhss-tool.py subscriber-delete --imsi 001011111111111
to add/remove subscribers. You will still need to manually create the
internet and ims APNs via the REST interface; I'll probably also add
that capability to the tool.
Once it's a bit more tested, I also would like to contribute it
upstream, at least once that is possible. To do that I'd have to make a
pull request, and making that pull request requires me to create a fork,
which is a copyright violation. wtf.
If that legal situation has cleared up, it might be worth considering either adding
native GSUP support to PyHSS (so it can be used by osmo-{msc,sgsn}, or to have
a converter like osmo_gsup2dia (the inverse of the existing osmo_dia2gsup).
Regards,
Harald
--
- Harald Welte <laforge(a)osmocom.org> https://laforge.gnumonks.org/
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Hi
Many thanks Harald for you answer
Yes, Ericsson SGSN MKX uses Classic mode (not ip-sns), and the osmo-pcu is configured with this line: gb-dialect classic.
We took the time to check the SGSN, BSC & network configuration and all seems well configured.
We continue to check and test but no way for now to correct this NS initialization step, and this error: NS_STATUS, Cause PROTOCOL ERROR - unspecified.
So, if you have other ideas of what could be the problem, you're welcome.
In addition, if you know someone who had set up this configuration, we would be very interested by he way of BSC and BTS, SGSN were configured.
Best regards
Jean-Marc
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Thank you.
Dear experts,
We are trying to connect an osmocom platform to an Ericsson platform, and are trying to make funtional 2G.
We use a VM for OSMO-BSC, a VM for OSMO-BTS-TRX + OSMO-PCU, and a Raspberry PI (trx-lms)
Concerning the Gb, we connected the OSMO-PCU to an MKX Ericsson, and we have an error at the NS setup step.
The communication between the SGSN Ericsson and the OSMO-PCU seems ok (IP / routing OK)
We hope that the Ericsson MKX SGSN is well configured.
We can see some packets: OSMO-PCU ---> SGSN : NS_RESET, Cause: P&M intervention, NS VCI: 0x1388, NSEI: 5000
and a response from the SGSN: NS_STATUS, Cause PROTOCOL ERROR - unspecified.
What could be the problem ? timers ? ns-vci, nsvc 1, encapsulation,...
Did someone test this: OSMOCOM with an ERICSSON SGSN ?
One point is that the nsvci is only defined on the BSC (not on the SGSN)
Many thanks in advance,
Best regards
Hoping that you could help us
Jean-Marc
-----------------------
BSC CONFIGURATION
-----------------------
bts 0
type osmo-bts
description LimeSDR Based BTS
band GSM900
cell_identity 41023
location_area_code 390
base_station_id_code 63
ms max power 15
cell reselection hysteresis 4
rxlev access min 0
radio-link-timeout 32
channel allocator mode chan-req ascending
channel allocator mode assignment ascending
channel allocator mode handover ascending
channel allocator mode vgcs-vbs ascending
rach tx integer 9
rach max transmission 7
rach max-delay 63
channel-description attach 1
channel-description bs-pa-mfrms 5
channel-description bs-ag-blks-res 1
no nch-position
no access-control-class-ramping
early-classmark-sending forbidden
early-classmark-sending-3g allowed
ipa unit-id 901 0
oml ipa stream-id 255 line 0
neighbor-list mode automatic
codec-support fr
gprs ns timer tns-block 3
gprs ns timer tns-block-retries 3
gprs ns timer tns-reset 3
gprs ns timer tns-reset-retries 3
gprs ns timer tns-test 30
gprs ns timer tns-alive 3
gprs ns timer tns-alive-retries 10
gprs nsei 5000
gprs nsvc 0 nsvci 5000
gprs nsvc 0 local udp port 23001
gprs nsvc 0 remote ip 172.20.168.220
gprs nsvc 0 remote udp port 2157
...
-----------------------
PCU CONFIGURATION
-----------------------
ns
timer tns-block 3
timer tns-block-retries 3
timer tns-reset 3
timer tns-reset-retries 3
timer tns-test 30
timer tns-alive 3
timer tns-alive-retries 10
timer tsns-prov 3
timer tsns-size-retries 3
timer tsns-config-retries 3
timer tsns-procedures-retries 3
pcu
flow-control-interval 10
cs 2
cs max 4
cs threshold 10 33
cs downgrade-threshold 200
cs link-quality-ranges cs1 6 cs2 5 8 cs3 7 13 cs4 12
mcs link-quality-ranges mcs1 6 mcs2 5 8 mcs3 7 13 mcs4 12 15 mcs5 14 17 mcs6 16 18 mcs7 17 20 mcs8 19 24 mcs9 23
mcs max 9
window-size 64 0
queue idle-ack-delay 10
queue codel